Apparatus for purifying furnace-gases.



U. WBDGE.

APPARATUS Foa PUBIPYING FURNAGE GASES.

APPLIOATXOH rILBD rnB.6,1so9.

Patented Dec. 19, 1911.

3 SHEETS-SHEET 1,

U. WEDGE.

APPABATUS FOB. PURIFYING PURNAGB GASES.

APPLIGATIGH FILED PEBEB,1909.

1,012,488, Patented Dec. 19,1911.

3 SHEETS-SHEET 2.

U. WEDGE.

APPARATUS FOB PURIFYING FUBNAGB GASES.

AIPLIUA'I'ION FILED IBB.6, 1909,

Patented Dec. 19, 1911.

3 SHEETS-SHEET 3 UTLEY WEDGE, 0F ARDMORE, PENNSYLVANIA..

APPARATUS FOR PURIFYING FURNACE-GASES.

Specification of Letters Patent.

Patented Dec. 19, 1911.

Application led February 6, 1909. Serial No. 476,527.

To all whom it may concern: t

Be it known that I, U'rLnY lVEDGn, a citizen of the United States. residing in Ardmore, Pennsylvania, have invented certain Improvements in Apparatus for Purifying Iiurnace-(ases, of which the following is a specification.

The object of my invention 1s to provide simpleV 'and eiective means for purifying furnace or other gases or fluids (hereinafter referred to as as by separating therefrom, particles hereinafter referred to as dust'I held in mechanical suspension therein. AThis object I attain in the manner hereinafter set forth, reference being had to the accompanying drawings, in which- Figurey 1 is a view, partly in vertical seetion and partly in elevation2 of a single purifier elenient constructed 1n ac cordanee with my invention; Fig. 2 1s a similar View illustrating a ther embodiment of the invention; Fig. is a` horizontal section en the line awa, Fig. I5 Fig. 4 is a longitudinal sectional view of a gas purifying apparatus in which are employed a battery of elements of the character shown in Fig. 1, and Figs. 5 and t are sectional views illustrating certain modifications of my invention.

Most materials which Vare subjected to the action of roasting or like furnaces contain sultid of iron which, when subjected to the furnace heat, is largely reduced to magnetic oxid or to lower sulfids of iron, which are also magnetic. vWhen dust particles carried off by the gas from such furnaces are subjected to magnetic influence, the magnetic particles will'be attracted and will also serve to trap or entrain non-magnetic particles and thus provide a means for removing from the gas practically all of the particle-s held in mechanical suspension therein.

I have ascertained that the cnstomarv high temperature of roasting furnace tine gases is noty high enough to destroy the effectiveness of magnets subjected to such tem perature but that, on the contrary, the etti ciency of a steel magnet is even materially increased thereby. My invention has therefore been devised with the view of providing means for separating from these high temperature furnace gases, during their ilow,the dust carried off by the gases from the furnace, and thereby, on the one hand, prevent such dust from interfering with the dfsircd subsequent use of the gas, and, on the other hand, prevent waste of the dust, if the saine has a commercial value.

Referring in the first instance to Fig. 1 of the drawing, 1 represents an ordinary T-eoupling, into one branch of which is screwed a short pipe section 2 closed at its outer end by a cap 3 which carries the core l of an electro-magnet, the insulated wire wrapping or coil of the latter being represented at 5 and being contained within the cap 3. Another branch ofthe coupling 1 has screwed into ity a short pipe section (i and within the latter, but of somewhat less diameter than the saine, is a. hollowcylindrical pole piece 7 from which projects a core 4 which screwed into a threaded opening in the inner end ot' the core Ll, and depends therefrom. Refractory and non-magnetic coverings 9 and l() surround the magnet cores 4 and 4, that portion ot' the covering '10 which is contained within the pipe seetion 2 being expanded in diameter so as to lill or almost fill said pipe section and a refractory rasher 11 being seated upon the outer end ot the pipe section 2, so that the dust prevented from gaining access to the interior oi the cap 3 in which the coil is' contained. Any desired number of elements thus tainstrueted are removably mounted upon a partition 12 between the receiving chamber .if and the discharge chamber .'1/ of the casing of the purifier, such partition being shown by dotted lines in Fig. 1` so that the gas passes in the direction indicated by the arrows in said ligure. lVhen the magnet is energized by the passage of an electric current through the coil 5 any particles of dust contained in the gas and susceptible to magnetic attraction will, as the gas passes through the contracted space between the pole piece 7 and the pipe section li be attracted to such pole piece and will cling thereto as long as the magnet continues to he energized, but` as soon as the iiow of cur rent through the coil 5 is discontinued and the magnet 1s thereby denergizcd, tl e par ticles adhering to the pole piece will drop therefrom and will be deposited in the receiving chamber below the partition 12, or the flow ot' current may be first reversed and then cnt oit in order to destroy any residual magnetism in the pole piece 7 which might be present if the flow of current through the magnet was simply cut oit `Without first being thus reversed. In Fig. 1 I have shown 110 au ordinary forni of reversing switch coniprising two line terminals .'r, a" and three magnet terminals a, 2c and y, a switch with tno arms fm and n being interposed between the line terminals and the magnet terminals7 the magnet terminal u: being connected to one pole of the magnet coil and both of the terminals r and y being connected to the other pole of the saine. Supposing that the :iria m of the switch leads from a. positive line terminal and the arm u from a negative line trrmiiuil` as shown in Fig. l, the adjustment of the switch with its arm m in contact with the magnet terminal a and its arm n. in contact with the magnet terminal` vc, "will cause the current to flow' through the coil of the magnet in one direction but by shifting the switch so that its arm m contarts with the terminal '1r and its arm n with the terminal y. the direction of How of the current will be reversed. The periodical intrrrnption` or reversal and interruption of the current flow may, in practice; be automatically effected by means under control of suitable time mechanism. If any dust passes the pole piece T from any cause such dust is prevented by the refractory and nonin-ignetic coverings 9 and 10 from adhering to the magnet cores l and l, and thereby :armani-ating in a position where such acruuiulatiou is not desired. The period of time during which thc magnet is dener gizcd need be but short but it is preferable to discontinue the flow of gas during such period in order to prevent it from carrying into thij discharge chamber the particles of dust originally contained in it and other particles which it might carry oiiE from the inl-iss falling from the pole piece 7 into the receiving chamber of the apparatus.

The separator shown in Figs. 2 and 3 is oi a simpler cl'iaracter than that shown in' lfig. l and comprises a pipe section G with slots 13 in its upper portion, the upper end of this pipe section being closed by the cap 3 and the magnet having a straight core 4 with hollow cylinfvlrical pole piece 7 at the bottoni. In this case the hanged lower end ot' the cap 3 may rest upon the roof 14 ol" the easing. and the pipe 6 may project l through a partition 15 in said casing, which partition serves to separate the receiving chamber a: from the discharge chamber y, the gas tlowing through the contracted space between the pipe (3 and the pole piece 7 and escaping through the slots 13 into the discharge chamber above the partition l5.

ln practice a number of elements will usually be combined a battery and in Fig. -l I have illustrated one form of` apparatus in which they are used in this Way, the gas entering the receiving chamber cc, below the partition 12 through the pipe 1G and escaping from the discharge chamber y, above said partition, through a pipe 17. In this case the coil of eacli magnet may be supplied with current by means of a pair of branch wires from a in line, as shown, one of the wires of each pairbeing provided with a switch 19 .for e talblisliing or interru ting the flow of l current through the cloi"7 or groups or sets of the magnets may belthus controlled independently of the others. Any element or element group of the series may thuY be deenerized independently of the others n order to discharge the acciumulated load lof dust into the receivingichamber inthe lower por-. tion of the apparatus, or the entire battery of elements may have their magnets simultaneously denergied by closing @switch 120 in the main line, the latter plan being the preferable one if the apparatus cornprises a series of non-communicating chambers side by side and each provided with a battery of elements, or is otherwise so constructed that the flow of gas past the pole pieces of one denergized battery may be cut of without interferin l with the flow of gas past the pole pieces o the remaining energized batteries.

In Figs. 5 and 6 lV have illustrated embodiments of my invention which are still simpler than that illustrated in Fig. 3, [he device shown in each of these l ures oonsisting of a pipe 21 for the How o the dustladen gas, this pipe containing the pole pieces Tf* of a number of electro-magnets disposed in succession in the direction of the flow and each having its coil 5 on the outside of the pipe and therefore measurably free from the influence of the heat of the gas passing through the pipe. The dustladen gas is introduced into the pipe through a branch 22 located below the magnets, and when the latter are dencrgized the accumulated masses of dust adhering thereto will fall into that portion of the pipe below the branch 22 from which they can be removed as desired.

I claim :q

1. Gas purifying apparatus in which are combined an electromagnet,means for causing the dust-laden gas to pass in proximity to the pole piece of said magnet, and heat resisting means for preventing access of the gas of the magnet core or coil.

Gas purifying apparatus in which are combined an electro-magnet having a hollow cylindrical pole piece, and means surrounding said pole piece and providing around it a passage of contracted area for the flow of the gas. 3. Gas purifying apparatus, in which are combined a casing having receiving and discharge chambers separated by a partition, and an electro-magnet having a pole piece occupying a passage formed in said parution, said electro-magnet being supported upon Vthe partition buty being unsecured thereto, whereb it is susceptible of being readily remove therefrom.

4. Gas purifying apparatus, in which are combined a easing having receiving and discharge chambers r paraled by a partition, and an element comprising an electroni-1g net, and means for directing the dust-laden gas into proximity to the pole piece of said magnet, said element -being supported upon said partition but being unsecured thereto, whereby it is susceptible of being readily removed therefrom.

5. Gas purifying apparatus in which are combined a plurality of electro-magnets, means'. for causing the dust-laden gas to flow in proximity to the pole pieces of said magnets, means for energizing the series of magnets, and means for dener izing some oi the magnets independently oA the others.

6. Gas purifying apparatus in which are combined a plurality of electro-magnets,

means for causing the dustladen gas to flow in proximity to the pole pieces of' said magnets, means for energizing the series of magnets, and means for denergizing, simultaneously, the magnets of the series.

T. Gas purifying apparatus in which are combined a plurality of electro-magnets, means for causing the dust-*laden gas to flow in proximity to the pole pieces of said magnets, means for energizing the magels of the series, means for denergizing some of the nmgnets independently of the others, and means For ,simultaneously denergizing all of 'the magnets of the series.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

Vlritnesses:

l'lAMIf/roN l). Tuin en, Kyra A. lSnAnLa. 

